1/* ===-- mulxc3.c - Implement __mulxc3 -------------------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __mulxc3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#if !_ARCH_PPC
16
17#include "int_lib.h"
18#include "int_math.h"
19
20/* Returns: the product of a + ib and c + id */
21
22COMPILER_RT_ABI long double _Complex
23__mulxc3(long double __a, long double __b, long double __c, long double __d)
24{
25    long double __ac = __a * __c;
26    long double __bd = __b * __d;
27    long double __ad = __a * __d;
28    long double __bc = __b * __c;
29    long double _Complex z;
30    __real__ z = __ac - __bd;
31    __imag__ z = __ad + __bc;
32    if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
33    {
34        int __recalc = 0;
35        if (crt_isinf(__a) || crt_isinf(__b))
36        {
37            __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
38            __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
39            if (crt_isnan(__c))
40                __c = crt_copysignl(0, __c);
41            if (crt_isnan(__d))
42                __d = crt_copysignl(0, __d);
43            __recalc = 1;
44        }
45        if (crt_isinf(__c) || crt_isinf(__d))
46        {
47            __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
48            __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
49            if (crt_isnan(__a))
50                __a = crt_copysignl(0, __a);
51            if (crt_isnan(__b))
52                __b = crt_copysignl(0, __b);
53            __recalc = 1;
54        }
55        if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
56                          crt_isinf(__ad) || crt_isinf(__bc)))
57        {
58            if (crt_isnan(__a))
59                __a = crt_copysignl(0, __a);
60            if (crt_isnan(__b))
61                __b = crt_copysignl(0, __b);
62            if (crt_isnan(__c))
63                __c = crt_copysignl(0, __c);
64            if (crt_isnan(__d))
65                __d = crt_copysignl(0, __d);
66            __recalc = 1;
67        }
68        if (__recalc)
69        {
70            __real__ z = CRT_INFINITY * (__a * __c - __b * __d);
71            __imag__ z = CRT_INFINITY * (__a * __d + __b * __c);
72        }
73    }
74    return z;
75}
76
77#endif
78